"At the end of a week in which Electronic Arts confirmed it wasn't developing a thing for the Wii U, one of the software engineers in EA Sports' Canada studio, in a series of since-deleted tweets, disparaged the console as 'crap' and suggested Nintendo should give up on hardware altogether. 'The Wii U is crap. Less powerful than an Xbox 360. Poor online/store. Weird tablet', tweeted Bob Summerwill, listed as a senior software engineer at EA Canada, in a reply to a tweet posting a link about EA's no-Wii U news. 'Nintendo are walking dead at this point'." The Wii U is turning into the 21st century's Virtual Boy.

So media are idiots and blow things out of proportions. What else is new?

he made his employer look bad.

This is absurd.
He did not reply to an official Nintendo tweet, he did not respond as an official spokes person for EA.
It's not like he said "EA is crap, I hate our products and our CEO is a retard" (and if it was Finland or any other scandinavian country he probably couldn't get fired for that either). He voiced his opinion on the product of *another* company that is not part of EA and that EA is not even making products for.
It's like an employee of Microsoft could not post on his blog that he don't like VMWare.